package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    private String USER_NICK_NAME_PREFIX = "user_";
    @Override
    public Result sendCoce(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式有误");
        }

        //3.符合生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.验证码保存到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.验证手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            return Result.fail("手机号格式有误！");
        }
        //2. 校验验证码--从redis中获取
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        String code = loginForm.getCode();
        if (cacheCode==null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码输入有误！");
        }
        //4.一致，根据手机号查用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //5.判断用户是否存在
        if (user == null){
            //6.用户不存在，创建并保存
            user = careteUserWithPhone(loginForm.getPhone());
        }

        //7.保存信息到redis中
        //7.1 随机生成token 作为登陆令牌
        String token = String.valueOf(UUID.randomUUID());
        //7.2 将User 对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValve)->fieldValve.toString()));

        //putALL可以将对象所有属性一次存入
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        //7.3 存储
        stringRedisTemplate.expire(LOGIN_USER_KEY+ token,LOGIN_USER_TTL,TimeUnit.SECONDS);
        //8. 返回
        return Result.ok(token);
    }

    private User careteUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        //3.返回用户
        return user;
    }
}
